feat(计分): 实现血战计分V1核心逻辑

- 新增血战计分服务，支持七对、清一色等基础番型及杠上花等特殊加番
- 扩展结算结果结构，包含番型明细与支付分数计算
- 新增PostGangContext记录杠后补摸窗口，用于判断杠上花/杠上炮
- 完善胡牌判定器，新增七对和对对胡识别方法
- 更新开发计划文档，补充注释规范要求
- 添加计分相关单元测试，确保核心逻辑正确性

.serena/memories/blood_battle_scoring_v1.md

@@ -0,0 +1,40 @@
+# 正式血战计分 V1（2026-03-20）
+- 已从工程占位分切换到“最小可扩展正式版”计分骨架。
+- 新增后端规则服务：`backend/src/main/java/com/xuezhanmaster/game/service/BloodBattleScoringService.java`
+- `SettlementResult` 已扩展 `settlementDetail`，结算事件 `SETTLEMENT_APPLIED` 现在会携带：
+  - `baseScore`
+  - `totalFan`
+  - `paymentScore`
+  - `fans`（番型明细）
+- 当前 V1 已支持的基础番型/加番：
+  - `七对`：2 番
+  - `对对胡`：1 番
+  - `金钩钓`：1 番
+  - `清一色`：2 番
+  - `根`：每个 1 番
+  - `抢杠胡`：1 番
+  - `杠上花`：1 番
+  - `杠上炮`：1 番
+  - `海底捞月`：1 番
+  - `海底炮`：1 番
+- 当前胡牌计分口径：`paymentScore = 1 << totalFan`
+  - 点炮胡：放炮者单独支付 `paymentScore`
+  - 自摸胡：所有未胡玩家各支付 `paymentScore`
+  - 抢杠胡：按胡牌番型 + `抢杠胡` 1 番，由补杠方单独支付
+  - 杠上花：在自摸胡基础上额外加 1 番
+  - 杠上炮：在点炮胡基础上额外加 1 番
+  - 海底捞月：自摸胡时若牌墙已空，额外加 1 番
+  - 海底炮：点炮胡时若牌墙已空，额外加 1 番
+- 当前杠分口径：
+  - `明杠/点杠`：放杠者单独支付 2 分
+  - `补杠`：所有未胡玩家各支付 1 分
+  - `暗杠`：所有未胡玩家各支付 2 分
+- `GameSession` 已新增 `PostGangContext`，只记录“杠后补摸到下一次自摸/弃牌裁决”这段窗口，用于判断 `杠上花/杠上炮`。
+- 海底相关不新增额外状态对象，直接复用“胡牌时牌墙已空”这一现有事实，保持 `KISS`。
+- `HuEvaluator` 已补 `七对` 胡牌判定，并暴露 `isSevenPairs` / `isPengPengHu` 给计分层复用。
+- 当前仍未实现：
+  - 自摸加番/加底地方变体
+  - 天胡、地胡
+  - 查叫、退税、过水不胡、一炮多响
+- 文档约定已补到 `docs/DEVELOPMENT_PLAN.md`：后续前端、后端、数据库表结构与 SQL 脚本都需要补充必要中文注释，重点说明复杂规则、关键字段、状态切换、约束原因和索引用途。
+- 最小验证：`cd backend && mvn clean test`，当前 48 个测试通过。

backend/src/main/java/com/xuezhanmaster/game/domain/GameSession.java

@@ -17,6 +17,8 @@ public class GameSession {
     private final GameTable table;
     private final List<GameEvent> events;
     private ResponseActionWindow pendingResponseActionWindow;
+    // 记录最近一次杠后补摸窗口，用于判断杠上花与杠上炮。
+    private PostGangContext postGangContext;
     private final Map<Integer, ActionType> responseActionSelections;
 
     public GameSession(String roomId, GameTable table) {
@@ -56,6 +58,14 @@ public class GameSession {
         this.pendingResponseActionWindow = pendingResponseActionWindow;
     }
 
+    public PostGangContext getPostGangContext() {
+        return postGangContext;
+    }
+
+    public void setPostGangContext(PostGangContext postGangContext) {
+        this.postGangContext = postGangContext;
+    }
+
     public Map<Integer, ActionType> getResponseActionSelections() {
         return responseActionSelections;
     }
@@ -63,4 +73,8 @@ public class GameSession {
     public void clearResponseActionSelections() {
         responseActionSelections.clear();
     }
+
+    public void clearPostGangContext() {
+        this.postGangContext = null;
+    }
 }

backend/src/main/java/com/xuezhanmaster/game/domain/PostGangContext.java

@@ -0,0 +1,7 @@
+package com.xuezhanmaster.game.domain;
+
+public record PostGangContext(
+        int seatNo,
+        String tileDisplayName
+) {
+}

backend/src/main/java/com/xuezhanmaster/game/domain/SettlementDetail.java

@@ -0,0 +1,11 @@
+package com.xuezhanmaster.game.domain;
+
+import java.util.List;
+
+public record SettlementDetail(
+        int baseScore,
+        int totalFan,
+        int paymentScore,
+        List<SettlementFan> fans
+) {
+}

backend/src/main/java/com/xuezhanmaster/game/domain/SettlementFan.java

@@ -0,0 +1,8 @@
+package com.xuezhanmaster.game.domain;
+
+public record SettlementFan(
+        String code,
+        String label,
+        int fan
+) {
+}

backend/src/main/java/com/xuezhanmaster/game/domain/SettlementResult.java

@@ -8,6 +8,7 @@ public record SettlementResult(
         int actorSeatNo,
         int sourceSeatNo,
         String triggerTile,
+        SettlementDetail settlementDetail,
         List<ScoreChange> scoreChanges
 ) {
 }

backend/src/main/java/com/xuezhanmaster/game/event/GameEvent.java

@@ -1,6 +1,8 @@
 package com.xuezhanmaster.game.event;
 
 import com.xuezhanmaster.game.domain.ScoreChange;
+import com.xuezhanmaster.game.domain.SettlementDetail;
+import com.xuezhanmaster.game.domain.SettlementFan;
 import com.xuezhanmaster.game.domain.SettlementResult;
 
 import java.time.Instant;
@@ -92,6 +94,7 @@ public record GameEvent(
         payload.put("actorSeatNo", settlementResult.actorSeatNo());
         payload.put("sourceSeatNo", settlementResult.sourceSeatNo());
         payload.put("triggerTile", settlementResult.triggerTile());
+        payload.put("settlementDetail", toSettlementDetailPayload(settlementResult.settlementDetail()));
         payload.put("scoreChanges", toScoreChangePayload(settlementResult.scoreChanges()));
         return of(gameId, GameEventType.SETTLEMENT_APPLIED, settlementResult.actorSeatNo(), payload);
     }
@@ -143,4 +146,21 @@ public record GameEvent(
         }
         return payload;
     }
+
+    private static Map<String, Object> toSettlementDetailPayload(SettlementDetail settlementDetail) {
+        Map<String, Object> payload = new LinkedHashMap<>();
+        payload.put("baseScore", settlementDetail.baseScore());
+        payload.put("totalFan", settlementDetail.totalFan());
+        payload.put("paymentScore", settlementDetail.paymentScore());
+        List<Map<String, Object>> fans = new ArrayList<>();
+        for (SettlementFan settlementFan : settlementDetail.fans()) {
+            Map<String, Object> item = new LinkedHashMap<>();
+            item.put("code", settlementFan.code());
+            item.put("label", settlementFan.label());
+            item.put("fan", settlementFan.fan());
+            fans.add(item);
+        }
+        payload.put("fans", fans);
+        return payload;
+    }
 }

backend/src/main/java/com/xuezhanmaster/game/service/BloodBattleScoringService.java

@@ -0,0 +1,167 @@
+package com.xuezhanmaster.game.service;
+
+import com.xuezhanmaster.game.domain.GameSeat;
+import com.xuezhanmaster.game.domain.MeldGroup;
+import com.xuezhanmaster.game.domain.MeldType;
+import com.xuezhanmaster.game.domain.SettlementDetail;
+import com.xuezhanmaster.game.domain.SettlementFan;
+import com.xuezhanmaster.game.domain.Tile;
+import com.xuezhanmaster.game.domain.TileSuit;
+import org.springframework.stereotype.Component;
+
+import java.util.ArrayList;
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Map;
+
+@Component
+public class BloodBattleScoringService {
+
+    private static final int BASE_SCORE = 1;
+    private static final int EXPOSED_GANG_SCORE = 2;
+    private static final int SUPPLEMENTAL_GANG_SCORE = 1;
+    private static final int CONCEALED_GANG_SCORE = 2;
+
+    private final HuEvaluator huEvaluator;
+
+    public BloodBattleScoringService(HuEvaluator huEvaluator) {
+        this.huEvaluator = huEvaluator;
+    }
+
+    public SettlementDetail buildDiscardHuDetail(
+            GameSeat winnerSeat,
+            boolean gangShangPao,
+            boolean haiDiPao
+    ) {
+        return buildHuDetail(winnerSeat, false, false, gangShangPao, false, haiDiPao);
+    }
+
+    public SettlementDetail buildSelfDrawHuDetail(
+            GameSeat winnerSeat,
+            boolean gangShangHua,
+            boolean haiDiLaoYue
+    ) {
+        // V1 先采用统一基础口径，不叠加地方“自摸加底/加番”变体。
+        return buildHuDetail(winnerSeat, false, gangShangHua, false, haiDiLaoYue, false);
+    }
+
+    public SettlementDetail buildRobbingGangHuDetail(GameSeat winnerSeat) {
+        return buildHuDetail(winnerSeat, true, false, false, false, false);
+    }
+
+    public SettlementDetail buildExposedGangDetail() {
+        return new SettlementDetail(BASE_SCORE, 0, EXPOSED_GANG_SCORE, List.of());
+    }
+
+    public SettlementDetail buildSupplementalGangDetail() {
+        return new SettlementDetail(BASE_SCORE, 0, SUPPLEMENTAL_GANG_SCORE, List.of());
+    }
+
+    public SettlementDetail buildConcealedGangDetail() {
+        return new SettlementDetail(BASE_SCORE, 0, CONCEALED_GANG_SCORE, List.of());
+    }
+
+    private SettlementDetail buildHuDetail(
+            GameSeat winnerSeat,
+            boolean robbingGang,
+            boolean gangShangHua,
+            boolean gangShangPao,
+            boolean haiDiLaoYue,
+            boolean haiDiPao
+    ) {
+        List<SettlementFan> fans = new ArrayList<>();
+        if (huEvaluator.isSevenPairs(winnerSeat.getHandTiles())) {
+            fans.add(new SettlementFan("QI_DUI", "七对", 2));
+        } else {
+            if (huEvaluator.isPengPengHu(winnerSeat.getHandTiles())) {
+                fans.add(new SettlementFan("DUI_DUI_HU", "对对胡", 1));
+            }
+            if (isJinGouDiao(winnerSeat)) {
+                fans.add(new SettlementFan("JIN_GOU_DIAO", "金钩钓", 1));
+            }
+        }
+        if (isQingYiSe(winnerSeat)) {
+            fans.add(new SettlementFan("QING_YI_SE", "清一色", 2));
+        }
+
+        int genCount = countGen(winnerSeat);
+        for (int i = 0; i < genCount; i++) {
+            fans.add(new SettlementFan("GEN", "根", 1));
+        }
+        if (gangShangHua) {
+            fans.add(new SettlementFan("GANG_SHANG_HUA", "杠上花", 1));
+        }
+        if (gangShangPao) {
+            fans.add(new SettlementFan("GANG_SHANG_PAO", "杠上炮", 1));
+        }
+        if (haiDiLaoYue) {
+            fans.add(new SettlementFan("HAI_DI_LAO_YUE", "海底捞月", 1));
+        }
+        if (haiDiPao) {
+            fans.add(new SettlementFan("HAI_DI_PAO", "海底炮", 1));
+        }
+        if (robbingGang) {
+            fans.add(new SettlementFan("QIANG_GANG_HU", "抢杠胡", 1));
+        }
+
+        int totalFan = fans.stream()
+                .mapToInt(SettlementFan::fan)
+                .sum();
+        int paymentScore = BASE_SCORE << totalFan;
+        return new SettlementDetail(BASE_SCORE, totalFan, paymentScore, List.copyOf(fans));
+    }
+
+    private boolean isJinGouDiao(GameSeat winnerSeat) {
+        return winnerSeat.getMeldGroups().size() == 4
+                && winnerSeat.getHandTiles().size() == 2
+                && winnerSeat.getHandTiles().get(0).equals(winnerSeat.getHandTiles().get(1));
+    }
+
+    private boolean isQingYiSe(GameSeat winnerSeat) {
+        TileSuit firstSuit = null;
+        for (Tile tile : winnerSeat.getHandTiles()) {
+            if (firstSuit == null) {
+                firstSuit = tile.getSuit();
+                continue;
+            }
+            if (tile.getSuit() != firstSuit) {
+                return false;
+            }
+        }
+        for (MeldGroup meldGroup : winnerSeat.getMeldGroups()) {
+            Tile meldTile = meldGroup.tile();
+            if (firstSuit == null) {
+                firstSuit = meldTile.getSuit();
+                continue;
+            }
+            if (meldTile.getSuit() != firstSuit) {
+                return false;
+            }
+        }
+        return firstSuit != null;
+    }
+
+    private int countGen(GameSeat winnerSeat) {
+        Map<Tile, Integer> tileCounts = new LinkedHashMap<>();
+        for (Tile tile : winnerSeat.getHandTiles()) {
+            tileCounts.merge(tile, 1, Integer::sum);
+        }
+        for (MeldGroup meldGroup : winnerSeat.getMeldGroups()) {
+            tileCounts.merge(meldGroup.tile(), tileCountForMeld(meldGroup.type()), Integer::sum);
+        }
+        int genCount = 0;
+        for (Integer count : tileCounts.values()) {
+            if (count == 4) {
+                genCount++;
+            }
+        }
+        return genCount;
+    }
+
+    private int tileCountForMeld(MeldType meldType) {
+        return switch (meldType) {
+            case PENG -> 3;
+            case MING_GANG, BU_GANG, AN_GANG -> 4;
+        };
+    }
+}

backend/src/main/java/com/xuezhanmaster/game/service/GameSessionService.java

@@ -6,6 +6,7 @@ import com.xuezhanmaster.game.domain.GamePhase;
 import com.xuezhanmaster.game.domain.GameSeat;
 import com.xuezhanmaster.game.domain.GameSession;
 import com.xuezhanmaster.game.domain.GameTable;
+import com.xuezhanmaster.game.domain.PostGangContext;
 import com.xuezhanmaster.game.domain.ResponseActionResolution;
 import com.xuezhanmaster.game.domain.ResponseActionSeatCandidate;
 import com.xuezhanmaster.game.domain.ResponseActionWindow;
@@ -495,6 +496,7 @@ public class GameSessionService {
     }
 
     private void continueAfterDiscardWithoutResponse(GameSession session) {
+        session.clearPostGangContext();
         moveToNextSeat(session.getTable(), session.getGameId());
         autoPlayBots(session);
         notifyActionIfHumanTurn(session);
@@ -526,6 +528,7 @@ public class GameSessionService {
     }
 
     private void executePeng(GameSession session, ResponseActionResolution resolution) {
+        session.clearPostGangContext();
         Tile claimedTile = parseTile(resolution.triggerTile());
         GameTable table = session.getTable();
         GameSeat winnerSeat = table.getSeats().get(resolution.winnerSeatNo());
@@ -548,6 +551,7 @@ public class GameSessionService {
     }
 
     private void executeGang(GameSession session, ResponseActionResolution resolution) {
+        session.clearPostGangContext();
         Tile claimedTile = parseTile(resolution.triggerTile());
         GameTable table = session.getTable();
         GameSeat winnerSeat = table.getSeats().get(resolution.winnerSeatNo());
@@ -580,6 +584,7 @@ public class GameSessionService {
 
         Tile drawnTile = table.getWallTiles().remove(0);
         winnerSeat.receiveTile(drawnTile);
+        markPostGangContext(session, winnerSeat.getSeatNo(), claimedTile.getDisplayName());
         appendAndPublish(session, GameEvent.tileDrawn(session.getGameId(), winnerSeat.getSeatNo(), table.getWallTiles().size()));
         appendAndPublish(session, GameEvent.turnSwitched(session.getGameId(), winnerSeat.getSeatNo()));
         continueFromResolvedActionTurn(session, winnerSeat);
@@ -619,6 +624,11 @@ public class GameSessionService {
                 sourceSeat.getSeatNo(),
                 claimedTile.getDisplayName()
         ));
+        // 牌墙已空时，这次点炮对应“最后一张牌后的弃牌胡”，按海底炮加番。
+        boolean gangShangPao = !isSupplementalGangWindow(responseActionWindow)
+                && isPostGangDiscard(session, sourceSeat.getSeatNo());
+        boolean haiDiPao = !isSupplementalGangWindow(responseActionWindow)
+                && table.getWallTiles().isEmpty();
         if (isSupplementalGangWindow(responseActionWindow)) {
             appendSettlementEvents(session, settlementService.settleRobbingGangHu(
                     table,
@@ -631,9 +641,12 @@ public class GameSessionService {
                 table,
                 winnerSeat.getSeatNo(),
                 sourceSeat.getSeatNo(),
-                    claimedTile.getDisplayName()
+                claimedTile.getDisplayName(),
+                gangShangPao,
+                haiDiPao
             ));
         }
+        session.clearPostGangContext();
 
         if (shouldFinishTable(table)) {
             table.setPhase(GamePhase.FINISHED);
@@ -647,6 +660,9 @@ public class GameSessionService {
     private void executeSelfDrawHu(GameSession session, String userId) {
         GameTable table = session.getTable();
         GameSeat winnerSeat = findSeatByUserId(table, userId);
+        // 自摸胡时牌墙已空，说明当前这张就是最后一张牌，按海底捞月加番。
+        boolean gangShangHua = isPostGangDraw(session, winnerSeat.getSeatNo());
+        boolean haiDiLaoYue = table.getWallTiles().isEmpty();
         winnerSeat.declareHu();
 
         appendAndPublish(session, GameEvent.responseActionDeclared(
@@ -659,8 +675,11 @@ public class GameSessionService {
         appendSettlementEvents(session, settlementService.settleSelfDrawHu(
                 table,
                 winnerSeat.getSeatNo(),
-                null
+                null,
+                gangShangHua,
+                haiDiLaoYue
         ));
+        session.clearPostGangContext();
 
         if (shouldFinishTable(table)) {
             table.setPhase(GamePhase.FINISHED);
@@ -703,6 +722,7 @@ public class GameSessionService {
 
         Tile drawnTile = table.getWallTiles().remove(0);
         winnerSeat.receiveTile(drawnTile);
+        markPostGangContext(session, winnerSeat.getSeatNo(), gangTile.getDisplayName());
         appendAndPublish(session, GameEvent.tileDrawn(session.getGameId(), winnerSeat.getSeatNo(), table.getWallTiles().size()));
         appendAndPublish(session, GameEvent.turnSwitched(session.getGameId(), winnerSeat.getSeatNo()));
         continueFromResolvedActionTurn(session, winnerSeat);
@@ -764,6 +784,7 @@ public class GameSessionService {
 
         Tile drawnTile = table.getWallTiles().remove(0);
         winnerSeat.receiveTile(drawnTile);
+        markPostGangContext(session, winnerSeat.getSeatNo(), gangTile.getDisplayName());
         appendAndPublish(session, GameEvent.tileDrawn(session.getGameId(), winnerSeat.getSeatNo(), table.getWallTiles().size()));
         appendAndPublish(session, GameEvent.turnSwitched(session.getGameId(), winnerSeat.getSeatNo()));
         continueFromResolvedActionTurn(session, winnerSeat);
@@ -815,6 +836,21 @@ public class GameSessionService {
         return huEvaluator.canHu(seat.getHandTiles());
     }
 
+    private void markPostGangContext(GameSession session, int seatNo, String tileDisplayName) {
+        // 杠后补摸只对当前这名玩家的下一次自摸/弃牌裁决有效。
+        session.setPostGangContext(new PostGangContext(seatNo, tileDisplayName));
+    }
+
+    private boolean isPostGangDraw(GameSession session, int seatNo) {
+        PostGangContext postGangContext = session.getPostGangContext();
+        return postGangContext != null && postGangContext.seatNo() == seatNo;
+    }
+
+    private boolean isPostGangDiscard(GameSession session, int sourceSeatNo) {
+        PostGangContext postGangContext = session.getPostGangContext();
+        return postGangContext != null && postGangContext.seatNo() == sourceSeatNo;
+    }
+
     private boolean isSupplementalGangWindow(ResponseActionWindow responseActionWindow) {
         return "SUPPLEMENTAL_GANG_DECLARED".equals(responseActionWindow.triggerEventType());
     }

backend/src/main/java/com/xuezhanmaster/game/service/HuEvaluator.java

@@ -14,6 +14,9 @@ public class HuEvaluator {
         if (tiles.size() % 3 != 2) {
             return false;
         }
+        if (isSevenPairs(tiles)) {
+            return true;
+        }
 
         int[] counts = buildCounts(tiles);
         for (int i = 0; i < counts.length; i++) {
@@ -29,6 +32,45 @@ public class HuEvaluator {
         return false;
     }
 
+    public boolean isSevenPairs(List<Tile> tiles) {
+        if (tiles.size() != 14) {
+            return false;
+        }
+
+        int[] counts = buildCounts(tiles);
+        int pairCount = 0;
+        for (int count : counts) {
+            if (count == 0) {
+                continue;
+            }
+            if (count != 2 && count != 4) {
+                return false;
+            }
+            pairCount += count / 2;
+        }
+        return pairCount == 7;
+    }
+
+    public boolean isPengPengHu(List<Tile> tiles) {
+        if (tiles.size() % 3 != 2) {
+            return false;
+        }
+
+        int[] counts = buildCounts(tiles);
+        for (int i = 0; i < counts.length; i++) {
+            if (counts[i] < 2) {
+                continue;
+            }
+            counts[i] -= 2;
+            if (canFormTripletsOnly(counts)) {
+                counts[i] += 2;
+                return true;
+            }
+            counts[i] += 2;
+        }
+        return false;
+    }
+
     public boolean canHuWithClaimedTile(List<Tile> handTiles, Tile claimedTile) {
         List<Tile> tiles = new ArrayList<>(handTiles);
         tiles.add(claimedTile);
@@ -73,6 +115,20 @@ public class HuEvaluator {
         return false;
     }
 
+    private boolean canFormTripletsOnly(int[] counts) {
+        int firstIndex = firstNonZeroIndex(counts);
+        if (firstIndex == -1) {
+            return true;
+        }
+        if (counts[firstIndex] < 3) {
+            return false;
+        }
+        counts[firstIndex] -= 3;
+        boolean result = canFormTripletsOnly(counts);
+        counts[firstIndex] += 3;
+        return result;
+    }
+
     private int firstNonZeroIndex(int[] counts) {
         for (int i = 0; i < counts.length; i++) {
             if (counts[i] > 0) {

backend/src/main/java/com/xuezhanmaster/game/service/SettlementService.java

@@ -4,6 +4,7 @@ import com.xuezhanmaster.game.domain.ActionType;
 import com.xuezhanmaster.game.domain.GameSeat;
 import com.xuezhanmaster.game.domain.GameTable;
 import com.xuezhanmaster.game.domain.ScoreChange;
+import com.xuezhanmaster.game.domain.SettlementDetail;
 import com.xuezhanmaster.game.domain.SettlementResult;
 import com.xuezhanmaster.game.domain.SettlementType;
 import org.springframework.stereotype.Service;
@@ -16,18 +17,25 @@ import java.util.Map;
 @Service
 public class SettlementService {
 
-    private static final int DIAN_PAO_HU_SCORE = 1;
+    private final BloodBattleScoringService scoringService;
-    private static final int ZI_MO_HU_SCORE = 1;
+
-    private static final int BU_GANG_SCORE = 1;
+    public SettlementService(BloodBattleScoringService scoringService) {
-    private static final int MING_GANG_SCORE = 1;
+        this.scoringService = scoringService;
-    private static final int AN_GANG_SCORE = 2;
+    }
 
     public SettlementResult settleDiscardHu(
             GameTable table,
             int winnerSeatNo,
             int sourceSeatNo,
-            String triggerTile
+            String triggerTile,
+            boolean gangShangPao,
+            boolean haiDiPao
     ) {
+        SettlementDetail settlementDetail = scoringService.buildDiscardHuDetail(
+                table.getSeats().get(winnerSeatNo),
+                gangShangPao,
+                haiDiPao
+        );
         return applySettlement(
                 table,
                 SettlementType.DIAN_PAO_HU,
@@ -35,7 +43,13 @@ public class SettlementService {
                 winnerSeatNo,
                 sourceSeatNo,
                 triggerTile,
-                orderedDeltas(winnerSeatNo, DIAN_PAO_HU_SCORE, sourceSeatNo, -DIAN_PAO_HU_SCORE)
+                settlementDetail,
+                orderedDeltas(
+                        winnerSeatNo,
+                        settlementDetail.paymentScore(),
+                        sourceSeatNo,
+                        -settlementDetail.paymentScore()
+                )
         );
     }
 
@@ -45,6 +59,7 @@ public class SettlementService {
             int sourceSeatNo,
             String triggerTile
     ) {
+        SettlementDetail settlementDetail = scoringService.buildExposedGangDetail();
         return applySettlement(
                 table,
                 SettlementType.MING_GANG,
@@ -52,23 +67,36 @@ public class SettlementService {
                 winnerSeatNo,
                 sourceSeatNo,
                 triggerTile,
-                orderedDeltas(winnerSeatNo, MING_GANG_SCORE, sourceSeatNo, -MING_GANG_SCORE)
+                settlementDetail,
+                orderedDeltas(
+                        winnerSeatNo,
+                        settlementDetail.paymentScore(),
+                        sourceSeatNo,
+                        -settlementDetail.paymentScore()
+                )
         );
     }
 
     public SettlementResult settleSelfDrawHu(
             GameTable table,
             int winnerSeatNo,
-            String triggerTile
+            String triggerTile,
+            boolean gangShangHua,
+            boolean haiDiLaoYue
     ) {
+        SettlementDetail settlementDetail = scoringService.buildSelfDrawHuDetail(
+                table.getSeats().get(winnerSeatNo),
+                gangShangHua,
+                haiDiLaoYue
+        );
         Map<Integer, Integer> scoreDeltas = new LinkedHashMap<>();
         int totalWinScore = 0;
         for (GameSeat seat : table.getSeats()) {
             if (seat.getSeatNo() == winnerSeatNo || seat.isWon()) {
                 continue;
             }
-            scoreDeltas.put(seat.getSeatNo(), -ZI_MO_HU_SCORE);
+            scoreDeltas.put(seat.getSeatNo(), -settlementDetail.paymentScore());
-            totalWinScore += ZI_MO_HU_SCORE;
+            totalWinScore += settlementDetail.paymentScore();
         }
         scoreDeltas.put(winnerSeatNo, totalWinScore);
         return applySettlement(
@@ -78,6 +106,7 @@ public class SettlementService {
                 winnerSeatNo,
                 winnerSeatNo,
                 triggerTile,
+                settlementDetail,
                 scoreDeltas
         );
     }
@@ -88,6 +117,7 @@ public class SettlementService {
             int sourceSeatNo,
             String triggerTile
     ) {
+        SettlementDetail settlementDetail = scoringService.buildRobbingGangHuDetail(table.getSeats().get(winnerSeatNo));
         return applySettlement(
                 table,
                 SettlementType.QIANG_GANG_HU,
@@ -95,7 +125,13 @@ public class SettlementService {
                 winnerSeatNo,
                 sourceSeatNo,
                 triggerTile,
-                orderedDeltas(winnerSeatNo, DIAN_PAO_HU_SCORE, sourceSeatNo, -DIAN_PAO_HU_SCORE)
+                settlementDetail,
+                orderedDeltas(
+                        winnerSeatNo,
+                        settlementDetail.paymentScore(),
+                        sourceSeatNo,
+                        -settlementDetail.paymentScore()
+                )
         );
     }
 
@@ -104,14 +140,15 @@ public class SettlementService {
             int winnerSeatNo,
             String triggerTile
     ) {
+        SettlementDetail settlementDetail = scoringService.buildSupplementalGangDetail();
         Map<Integer, Integer> scoreDeltas = new LinkedHashMap<>();
         int totalWinScore = 0;
         for (GameSeat seat : table.getSeats()) {
             if (seat.getSeatNo() == winnerSeatNo || seat.isWon()) {
                 continue;
             }
-            scoreDeltas.put(seat.getSeatNo(), -BU_GANG_SCORE);
+            scoreDeltas.put(seat.getSeatNo(), -settlementDetail.paymentScore());
-            totalWinScore += BU_GANG_SCORE;
+            totalWinScore += settlementDetail.paymentScore();
         }
         scoreDeltas.put(winnerSeatNo, totalWinScore);
         return applySettlement(
@@ -121,6 +158,7 @@ public class SettlementService {
                 winnerSeatNo,
                 winnerSeatNo,
                 triggerTile,
+                settlementDetail,
                 scoreDeltas
         );
     }
@@ -130,14 +168,15 @@ public class SettlementService {
             int winnerSeatNo,
             String triggerTile
     ) {
+        SettlementDetail settlementDetail = scoringService.buildConcealedGangDetail();
         Map<Integer, Integer> scoreDeltas = new LinkedHashMap<>();
         int totalWinScore = 0;
         for (GameSeat seat : table.getSeats()) {
             if (seat.getSeatNo() == winnerSeatNo || seat.isWon()) {
                 continue;
             }
-            scoreDeltas.put(seat.getSeatNo(), -AN_GANG_SCORE);
+            scoreDeltas.put(seat.getSeatNo(), -settlementDetail.paymentScore());
-            totalWinScore += AN_GANG_SCORE;
+            totalWinScore += settlementDetail.paymentScore();
         }
         scoreDeltas.put(winnerSeatNo, totalWinScore);
         return applySettlement(
@@ -147,6 +186,7 @@ public class SettlementService {
                 winnerSeatNo,
                 winnerSeatNo,
                 triggerTile,
+                settlementDetail,
                 scoreDeltas
         );
     }
@@ -158,6 +198,7 @@ public class SettlementService {
             int actorSeatNo,
             int sourceSeatNo,
             String triggerTile,
+            SettlementDetail settlementDetail,
             Map<Integer, Integer> scoreDeltas
     ) {
         List<ScoreChange> scoreChanges = new ArrayList<>();
@@ -176,6 +217,7 @@ public class SettlementService {
                 actorSeatNo,
                 sourceSeatNo,
                 triggerTile,
+                settlementDetail,
                 List.copyOf(scoreChanges)
         );
     }

backend/src/test/java/com/xuezhanmaster/game/event/GameEventTest.java

@@ -2,6 +2,8 @@ package com.xuezhanmaster.game.event;
 
 import com.xuezhanmaster.game.domain.ActionType;
 import com.xuezhanmaster.game.domain.ScoreChange;
+import com.xuezhanmaster.game.domain.SettlementDetail;
+import com.xuezhanmaster.game.domain.SettlementFan;
 import com.xuezhanmaster.game.domain.SettlementResult;
 import com.xuezhanmaster.game.domain.SettlementType;
 import org.junit.jupiter.api.Test;
@@ -54,6 +56,12 @@ class GameEventTest {
                 2,
                 0,
                 "9筒",
+                new SettlementDetail(
+                        1,
+                        2,
+                        4,
+                        List.of(new SettlementFan("QING_YI_SE", "清一色", 2))
+                ),
                 List.of(
                         new ScoreChange(2, 1, 3),
                         new ScoreChange(0, -1, -2)
@@ -69,7 +77,12 @@ class GameEventTest {
                 .containsEntry("actionType", "HU")
                 .containsEntry("sourceSeatNo", 0)
                 .containsEntry("triggerTile", "9筒");
+        assertThat(settlementApplied.payload()).containsKey("settlementDetail");
         assertThat(settlementApplied.payload()).containsKey("scoreChanges");
+        assertThat((java.util.Map<String, Object>) settlementApplied.payload().get("settlementDetail"))
+                .containsEntry("baseScore", 1)
+                .containsEntry("totalFan", 2)
+                .containsEntry("paymentScore", 4);
 
         assertThat(scoreChanged.eventType()).isEqualTo(GameEventType.SCORE_CHANGED);
         assertThat(scoreChanged.payload())

backend/src/test/java/com/xuezhanmaster/game/service/BloodBattleScoringServiceTest.java

@@ -0,0 +1,128 @@
+package com.xuezhanmaster.game.service;
+
+import com.xuezhanmaster.game.domain.GameSeat;
+import com.xuezhanmaster.game.domain.SettlementDetail;
+import com.xuezhanmaster.game.domain.Tile;
+import com.xuezhanmaster.game.domain.TileSuit;
+import org.junit.jupiter.api.Test;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+class BloodBattleScoringServiceTest {
+
+    private final HuEvaluator huEvaluator = new HuEvaluator();
+    private final BloodBattleScoringService scoringService = new BloodBattleScoringService(huEvaluator);
+
+    @Test
+    void shouldEvaluateQingQiDuiWithGen() {
+        GameSeat winnerSeat = new GameSeat(0, false, "user-1", "玩家一");
+        winnerSeat.receiveTile(new Tile(TileSuit.WAN, 1));
+        winnerSeat.receiveTile(new Tile(TileSuit.WAN, 1));
+        winnerSeat.receiveTile(new Tile(TileSuit.WAN, 1));
+        winnerSeat.receiveTile(new Tile(TileSuit.WAN, 1));
+        winnerSeat.receiveTile(new Tile(TileSuit.WAN, 2));
+        winnerSeat.receiveTile(new Tile(TileSuit.WAN, 2));
+        winnerSeat.receiveTile(new Tile(TileSuit.WAN, 3));
+        winnerSeat.receiveTile(new Tile(TileSuit.WAN, 3));
+        winnerSeat.receiveTile(new Tile(TileSuit.WAN, 4));
+        winnerSeat.receiveTile(new Tile(TileSuit.WAN, 4));
+        winnerSeat.receiveTile(new Tile(TileSuit.WAN, 5));
+        winnerSeat.receiveTile(new Tile(TileSuit.WAN, 5));
+        winnerSeat.receiveTile(new Tile(TileSuit.WAN, 6));
+        winnerSeat.receiveTile(new Tile(TileSuit.WAN, 6));
+
+        SettlementDetail settlementDetail = scoringService.buildSelfDrawHuDetail(winnerSeat, false, false);
+
+        assertThat(settlementDetail.totalFan()).isEqualTo(5);
+        assertThat(settlementDetail.paymentScore()).isEqualTo(32);
+        assertThat(settlementDetail.fans())
+                .extracting(fan -> fan.code())
+                .containsExactly("QI_DUI", "QING_YI_SE", "GEN");
+    }
+
+    @Test
+    void shouldEvaluateJinGouDiaoAndRobbingGangHu() {
+        GameSeat winnerSeat = new GameSeat(0, false, "user-1", "玩家一");
+        winnerSeat.addPengMeld(new Tile(TileSuit.WAN, 1), 1);
+        winnerSeat.addPengMeld(new Tile(TileSuit.WAN, 2), 1);
+        winnerSeat.addMingGangMeld(new Tile(TileSuit.WAN, 3), 1);
+        winnerSeat.addAnGangMeld(new Tile(TileSuit.WAN, 4));
+        winnerSeat.receiveTile(new Tile(TileSuit.WAN, 9));
+        winnerSeat.receiveTile(new Tile(TileSuit.WAN, 9));
+
+        SettlementDetail settlementDetail = scoringService.buildRobbingGangHuDetail(winnerSeat);
+
+        assertThat(settlementDetail.totalFan()).isEqualTo(7);
+        assertThat(settlementDetail.paymentScore()).isEqualTo(128);
+        assertThat(settlementDetail.fans())
+                .extracting(fan -> fan.code())
+                .containsExactly("DUI_DUI_HU", "JIN_GOU_DIAO", "QING_YI_SE", "GEN", "GEN", "QIANG_GANG_HU");
+    }
+
+    @Test
+    void shouldExposeFixedGangScores() {
+        assertThat(scoringService.buildExposedGangDetail().paymentScore()).isEqualTo(2);
+        assertThat(scoringService.buildSupplementalGangDetail().paymentScore()).isEqualTo(1);
+        assertThat(scoringService.buildConcealedGangDetail().paymentScore()).isEqualTo(2);
+    }
+
+    @Test
+    void shouldAddGangShangHuaAndGangShangPaoFans() {
+        GameSeat winnerSeat = new GameSeat(0, false, "user-1", "玩家一");
+        winnerSeat.receiveTile(new Tile(TileSuit.WAN, 1));
+        winnerSeat.receiveTile(new Tile(TileSuit.WAN, 1));
+        winnerSeat.receiveTile(new Tile(TileSuit.WAN, 1));
+        winnerSeat.receiveTile(new Tile(TileSuit.WAN, 2));
+        winnerSeat.receiveTile(new Tile(TileSuit.WAN, 3));
+        winnerSeat.receiveTile(new Tile(TileSuit.WAN, 4));
+        winnerSeat.receiveTile(new Tile(TileSuit.TONG, 2));
+        winnerSeat.receiveTile(new Tile(TileSuit.TONG, 3));
+        winnerSeat.receiveTile(new Tile(TileSuit.TONG, 4));
+        winnerSeat.receiveTile(new Tile(TileSuit.TIAO, 5));
+        winnerSeat.receiveTile(new Tile(TileSuit.TIAO, 6));
+        winnerSeat.receiveTile(new Tile(TileSuit.TIAO, 7));
+        winnerSeat.receiveTile(new Tile(TileSuit.TONG, 9));
+        winnerSeat.receiveTile(new Tile(TileSuit.TONG, 9));
+
+        SettlementDetail gangShangHua = scoringService.buildSelfDrawHuDetail(winnerSeat, true, false);
+        SettlementDetail gangShangPao = scoringService.buildDiscardHuDetail(winnerSeat, true, false);
+
+        assertThat(gangShangHua.totalFan()).isEqualTo(1);
+        assertThat(gangShangHua.paymentScore()).isEqualTo(2);
+        assertThat(gangShangHua.fans()).extracting(fan -> fan.code()).containsExactly("GANG_SHANG_HUA");
+
+        assertThat(gangShangPao.totalFan()).isEqualTo(1);
+        assertThat(gangShangPao.paymentScore()).isEqualTo(2);
+        assertThat(gangShangPao.fans()).extracting(fan -> fan.code()).containsExactly("GANG_SHANG_PAO");
+    }
+
+    @Test
+    void shouldAddHaiDiFans() {
+        GameSeat winnerSeat = new GameSeat(0, false, "user-1", "玩家一");
+        winnerSeat.receiveTile(new Tile(TileSuit.WAN, 1));
+        winnerSeat.receiveTile(new Tile(TileSuit.WAN, 1));
+        winnerSeat.receiveTile(new Tile(TileSuit.WAN, 1));
+        winnerSeat.receiveTile(new Tile(TileSuit.WAN, 2));
+        winnerSeat.receiveTile(new Tile(TileSuit.WAN, 3));
+        winnerSeat.receiveTile(new Tile(TileSuit.WAN, 4));
+        winnerSeat.receiveTile(new Tile(TileSuit.TONG, 2));
+        winnerSeat.receiveTile(new Tile(TileSuit.TONG, 3));
+        winnerSeat.receiveTile(new Tile(TileSuit.TONG, 4));
+        winnerSeat.receiveTile(new Tile(TileSuit.TIAO, 5));
+        winnerSeat.receiveTile(new Tile(TileSuit.TIAO, 6));
+        winnerSeat.receiveTile(new Tile(TileSuit.TIAO, 7));
+        winnerSeat.receiveTile(new Tile(TileSuit.TONG, 9));
+        winnerSeat.receiveTile(new Tile(TileSuit.TONG, 9));
+
+        SettlementDetail haiDiLaoYue = scoringService.buildSelfDrawHuDetail(winnerSeat, false, true);
+        SettlementDetail haiDiPao = scoringService.buildDiscardHuDetail(winnerSeat, false, true);
+
+        assertThat(haiDiLaoYue.totalFan()).isEqualTo(1);
+        assertThat(haiDiLaoYue.paymentScore()).isEqualTo(2);
+        assertThat(haiDiLaoYue.fans()).extracting(fan -> fan.code()).containsExactly("HAI_DI_LAO_YUE");
+
+        assertThat(haiDiPao.totalFan()).isEqualTo(1);
+        assertThat(haiDiPao.paymentScore()).isEqualTo(2);
+        assertThat(haiDiPao.fans()).extracting(fan -> fan.code()).containsExactly("HAI_DI_PAO");
+    }
+}

backend/src/test/java/com/xuezhanmaster/game/service/GameSessionServiceTest.java

@@ -34,13 +34,14 @@ class GameSessionServiceTest {
 
     private final RoomService roomService = new RoomService();
     private final HuEvaluator huEvaluator = new HuEvaluator();
+    private final BloodBattleScoringService bloodBattleScoringService = new BloodBattleScoringService(huEvaluator);
     private final GameSessionService gameSessionService = new GameSessionService(
             roomService,
             new GameEngine(new DeckFactory()),
             new GameActionProcessor(huEvaluator),
             new ResponseActionWindowBuilder(huEvaluator),
             new ResponseActionResolver(),
-            new SettlementService(),
+            new SettlementService(bloodBattleScoringService),
             huEvaluator,
             new StrategyService(),
             new PlayerVisibilityService(),
@@ -255,8 +256,8 @@ class GameSessionServiceTest {
         );
 
         assertThat(afterGang.currentSeatNo()).isEqualTo(1);
-        assertThat(afterGang.selfSeat().score()).isEqualTo(1);
+        assertThat(afterGang.selfSeat().score()).isEqualTo(2);
-        assertThat(afterGang.seats().get(0).score()).isEqualTo(-1);
+        assertThat(afterGang.seats().get(0).score()).isEqualTo(-2);
         assertThat(afterGang.selfSeat().melds()).containsExactly("明杠:" + discardTile);
         assertThat(session.getEvents())
                 .extracting(event -> event.eventType())
@@ -420,17 +421,56 @@ class GameSessionServiceTest {
         assertThat(afterGang.selfSeat().handTiles()).hasSize(11);
     }
 
+    @Test
+    void shouldScoreGangShangHuaAfterReplacementDrawHu() {
+        RoomSummaryResponse room = roomService.createRoom(new CreateRoomRequest("host-1", true));
+        roomService.joinRoom(room.roomId(), new com.xuezhanmaster.room.dto.JoinRoomRequest("player-2", "玩家二"));
+        roomService.joinRoom(room.roomId(), new com.xuezhanmaster.room.dto.JoinRoomRequest("player-3", "玩家三"));
+        roomService.joinRoom(room.roomId(), new com.xuezhanmaster.room.dto.JoinRoomRequest("player-4", "玩家四"));
+        roomService.toggleReady(room.roomId(), new ToggleReadyRequest("host-1", true));
+        roomService.toggleReady(room.roomId(), new ToggleReadyRequest("player-2", true));
+        roomService.toggleReady(room.roomId(), new ToggleReadyRequest("player-3", true));
+        roomService.toggleReady(room.roomId(), new ToggleReadyRequest("player-4", true));
+
+        GameStateResponse started = gameSessionService.startGame(room.roomId(), "host-1");
+        gameSessionService.selectLackSuit(started.gameId(), "host-1", TileSuit.WAN.name());
+        gameSessionService.selectLackSuit(started.gameId(), "player-2", TileSuit.TONG.name());
+        gameSessionService.selectLackSuit(started.gameId(), "player-3", TileSuit.TIAO.name());
+        gameSessionService.selectLackSuit(started.gameId(), "player-4", TileSuit.WAN.name());
+
+        GameSession session = getSession(started.gameId());
+        prepareGangShangHuaHand(session.getTable().getSeats().get(0), "3万");
+        setNextWallTile(session, "9筒");
+
+        GameStateResponse afterGang = gameSessionService.performAction(
+                started.gameId(),
+                new GameActionRequest("host-1", "GANG", "3万", null)
+        );
+        GameStateResponse afterHu = gameSessionService.performAction(
+                started.gameId(),
+                new GameActionRequest("host-1", "HU", null, null)
+        );
+
+        assertThat(afterGang.currentSeatNo()).isEqualTo(0);
+        assertThat(afterHu.selfSeat().won()).isTrue();
+        assertThat(afterHu.selfSeat().score()).isEqualTo(12);
+        assertThat(afterHu.seats()).extracting(seat -> seat.score()).contains(12, -4, -4, -4);
+        assertThat(latestSettlementFanCodes(session)).contains("GANG_SHANG_HUA");
+    }
+
     @Test
     void shouldRejectSelfConcealedGangWithoutFourMatchingTiles() {
         RoomSummaryResponse room = roomService.createRoom(new CreateRoomRequest("host-1", true));
         roomService.toggleReady(room.roomId(), new ToggleReadyRequest("host-1", true));
 
         GameStateResponse started = gameSessionService.startGame(room.roomId(), "host-1");
-        gameSessionService.selectLackSuit(started.gameId(), "host-1", TileSuit.WAN.name());
+        GameStateResponse afterLack = gameSessionService.selectLackSuit(started.gameId(), "host-1", TileSuit.WAN.name());
+        GameSession session = getSession(started.gameId());
+        String invalidGangTile = findTileWithLessThanFourCopies(session.getTable().getSeats().get(0));
 
         assertThatThrownBy(() -> gameSessionService.performAction(
-                started.gameId(),
+                afterLack.gameId(),
-                new GameActionRequest("host-1", "GANG", "3万", null)
+                new GameActionRequest("host-1", "GANG", invalidGangTile, null)
         ))
                 .isInstanceOf(BusinessException.class)
                 .extracting(throwable -> ((BusinessException) throwable).getCode())
@@ -504,11 +544,106 @@ class GameSessionServiceTest {
         assertThat(afterHu.phase()).isEqualTo("PLAYING");
         assertThat(afterHu.currentSeatNo()).isEqualTo(2);
         assertThat(afterHu.selfSeat().won()).isTrue();
-        assertThat(afterHu.selfSeat().score()).isEqualTo(1);
+        assertThat(afterHu.selfSeat().score()).isEqualTo(2);
-        assertThat(afterHu.seats().get(0).score()).isEqualTo(-1);
+        assertThat(afterHu.seats().get(0).score()).isEqualTo(-2);
         assertThat(afterHu.seats().get(0).melds()).containsExactly("碰:9筒");
     }
 
+    @Test
+    void shouldScoreGangShangPaoOnDiscardAfterReplacementDraw() {
+        RoomSummaryResponse room = roomService.createRoom(new CreateRoomRequest("host-1", true));
+        roomService.joinRoom(room.roomId(), new com.xuezhanmaster.room.dto.JoinRoomRequest("player-2", "玩家二"));
+        roomService.toggleReady(room.roomId(), new ToggleReadyRequest("host-1", true));
+        roomService.toggleReady(room.roomId(), new ToggleReadyRequest("player-2", true));
+
+        GameStateResponse started = gameSessionService.startGame(room.roomId(), "host-1");
+        gameSessionService.selectLackSuit(started.gameId(), "host-1", TileSuit.WAN.name());
+        gameSessionService.selectLackSuit(started.gameId(), "player-2", TileSuit.TONG.name());
+
+        GameSession session = getSession(started.gameId());
+        prepareGangShangPaoHand(session.getTable().getSeats().get(0), "3万");
+        prepareWinningHand(session.getTable().getSeats().get(1));
+        removeMatchingTilesFromOtherSeats(session, "9筒", 0, 1);
+        setNextWallTile(session, "8条");
+
+        GameStateResponse afterGang = gameSessionService.performAction(
+                started.gameId(),
+                new GameActionRequest("host-1", "GANG", "3万", null)
+        );
+        GameStateResponse afterHu = gameSessionService.discardTile(started.gameId(), "host-1", "9筒");
+        afterHu = gameSessionService.performAction(
+                started.gameId(),
+                new GameActionRequest("player-2", "HU", "9筒", 0)
+        );
+
+        assertThat(afterGang.currentSeatNo()).isEqualTo(0);
+        assertThat(afterHu.selfSeat().won()).isTrue();
+        assertThat(afterHu.selfSeat().score()).isEqualTo(0);
+        assertThat(afterHu.seats().get(0).score()).isEqualTo(4);
+        assertThat(latestSettlementFanCodes(session)).contains("GANG_SHANG_PAO");
+    }
+
+    @Test
+    void shouldScoreHaiDiLaoYueOnLastTileSelfDraw() {
+        RoomSummaryResponse room = roomService.createRoom(new CreateRoomRequest("host-1", true));
+        roomService.joinRoom(room.roomId(), new com.xuezhanmaster.room.dto.JoinRoomRequest("player-2", "玩家二"));
+        roomService.joinRoom(room.roomId(), new com.xuezhanmaster.room.dto.JoinRoomRequest("player-3", "玩家三"));
+        roomService.joinRoom(room.roomId(), new com.xuezhanmaster.room.dto.JoinRoomRequest("player-4", "玩家四"));
+        roomService.toggleReady(room.roomId(), new ToggleReadyRequest("host-1", true));
+        roomService.toggleReady(room.roomId(), new ToggleReadyRequest("player-2", true));
+        roomService.toggleReady(room.roomId(), new ToggleReadyRequest("player-3", true));
+        roomService.toggleReady(room.roomId(), new ToggleReadyRequest("player-4", true));
+
+        GameStateResponse started = gameSessionService.startGame(room.roomId(), "host-1");
+        gameSessionService.selectLackSuit(started.gameId(), "host-1", TileSuit.WAN.name());
+        gameSessionService.selectLackSuit(started.gameId(), "player-2", TileSuit.TONG.name());
+        gameSessionService.selectLackSuit(started.gameId(), "player-3", TileSuit.TIAO.name());
+        gameSessionService.selectLackSuit(started.gameId(), "player-4", TileSuit.WAN.name());
+
+        GameSession session = getSession(started.gameId());
+        prepareSelfDrawWinningHand(session.getTable().getSeats().get(0));
+        session.getTable().getWallTiles().clear();
+
+        GameStateResponse afterHu = gameSessionService.performAction(
+                started.gameId(),
+                new GameActionRequest("host-1", "HU", null, null)
+        );
+
+        assertThat(afterHu.selfSeat().won()).isTrue();
+        assertThat(afterHu.selfSeat().score()).isEqualTo(6);
+        assertThat(afterHu.seats()).extracting(seat -> seat.score()).contains(6, -2, -2, -2);
+        assertThat(latestSettlementFanCodes(session)).contains("HAI_DI_LAO_YUE");
+    }
+
+    @Test
+    void shouldScoreHaiDiPaoOnLastTileDiscardHu() {
+        RoomSummaryResponse room = roomService.createRoom(new CreateRoomRequest("host-1", true));
+        roomService.joinRoom(room.roomId(), new com.xuezhanmaster.room.dto.JoinRoomRequest("player-2", "玩家二"));
+        roomService.toggleReady(room.roomId(), new ToggleReadyRequest("host-1", true));
+        roomService.toggleReady(room.roomId(), new ToggleReadyRequest("player-2", true));
+
+        GameStateResponse started = gameSessionService.startGame(room.roomId(), "host-1");
+        gameSessionService.selectLackSuit(started.gameId(), "host-1", TileSuit.WAN.name());
+        gameSessionService.selectLackSuit(started.gameId(), "player-2", TileSuit.TONG.name());
+
+        GameSession session = getSession(started.gameId());
+        prepareWinningHand(session.getTable().getSeats().get(1));
+        ensureSeatHasMatchingTiles(session.getTable().getSeats().get(0), "9筒", 1);
+        removeMatchingTilesFromOtherSeats(session, "9筒", 0, 1);
+        session.getTable().getWallTiles().clear();
+
+        gameSessionService.discardTile(started.gameId(), "host-1", "9筒");
+        GameStateResponse afterHu = gameSessionService.performAction(
+                started.gameId(),
+                new GameActionRequest("player-2", "HU", "9筒", 0)
+        );
+
+        assertThat(afterHu.selfSeat().won()).isTrue();
+        assertThat(afterHu.selfSeat().score()).isEqualTo(2);
+        assertThat(afterHu.seats().get(0).score()).isEqualTo(-2);
+        assertThat(latestSettlementFanCodes(session)).contains("HAI_DI_PAO");
+    }
+
     @Test
     void shouldRejectSelfDrawHuWhenHandIsNotWinning() {
         RoomSummaryResponse room = roomService.createRoom(new CreateRoomRequest("host-1", true));
@@ -575,6 +710,21 @@ class GameSessionServiceTest {
         };
     }
 
+    private String findTileWithLessThanFourCopies(GameSeat seat) {
+        for (Tile tile : seat.getHandTiles()) {
+            int matchCount = 0;
+            for (Tile handTile : seat.getHandTiles()) {
+                if (handTile.equals(tile)) {
+                    matchCount++;
+                }
+            }
+            if (matchCount < 4) {
+                return tile.getDisplayName();
+            }
+        }
+        throw new IllegalStateException("测试手牌意外全部为四张同牌");
+    }
+
     private void prepareWinningHand(GameSeat seat) {
         seat.getHandTiles().clear();
         seat.receiveTile(new Tile(TileSuit.WAN, 1));
@@ -628,6 +778,42 @@ class GameSessionServiceTest {
         seat.receiveTile(new Tile(TileSuit.WAN, 9));
     }
 
+    private void prepareGangShangHuaHand(GameSeat seat, String gangTileDisplayName) {
+        seat.getHandTiles().clear();
+        Tile gangTile = parseTile(gangTileDisplayName);
+        for (int i = 0; i < 4; i++) {
+            seat.receiveTile(gangTile);
+        }
+        seat.receiveTile(new Tile(TileSuit.WAN, 1));
+        seat.receiveTile(new Tile(TileSuit.WAN, 1));
+        seat.receiveTile(new Tile(TileSuit.WAN, 1));
+        seat.receiveTile(new Tile(TileSuit.WAN, 2));
+        seat.receiveTile(new Tile(TileSuit.WAN, 3));
+        seat.receiveTile(new Tile(TileSuit.WAN, 4));
+        seat.receiveTile(new Tile(TileSuit.TONG, 2));
+        seat.receiveTile(new Tile(TileSuit.TONG, 3));
+        seat.receiveTile(new Tile(TileSuit.TONG, 4));
+        seat.receiveTile(new Tile(TileSuit.TONG, 9));
+    }
+
+    private void prepareGangShangPaoHand(GameSeat seat, String gangTileDisplayName) {
+        seat.getHandTiles().clear();
+        Tile gangTile = parseTile(gangTileDisplayName);
+        for (int i = 0; i < 4; i++) {
+            seat.receiveTile(gangTile);
+        }
+        seat.receiveTile(new Tile(TileSuit.WAN, 1));
+        seat.receiveTile(new Tile(TileSuit.WAN, 1));
+        seat.receiveTile(new Tile(TileSuit.WAN, 1));
+        seat.receiveTile(new Tile(TileSuit.WAN, 2));
+        seat.receiveTile(new Tile(TileSuit.WAN, 3));
+        seat.receiveTile(new Tile(TileSuit.WAN, 4));
+        seat.receiveTile(new Tile(TileSuit.TONG, 2));
+        seat.receiveTile(new Tile(TileSuit.TONG, 3));
+        seat.receiveTile(new Tile(TileSuit.TONG, 4));
+        seat.receiveTile(new Tile(TileSuit.TONG, 9));
+    }
+
     private void prepareSupplementalGangHand(GameSeat seat, String gangTileDisplayName) {
         seat.getHandTiles().clear();
         seat.getMeldGroups().clear();
@@ -645,4 +831,21 @@ class GameSessionServiceTest {
         seat.receiveTile(new Tile(TileSuit.TIAO, 9));
         seat.receiveTile(new Tile(TileSuit.WAN, 9));
     }
+
+    private void setNextWallTile(GameSession session, String tileDisplayName) {
+        session.getTable().getWallTiles().set(0, parseTile(tileDisplayName));
+    }
+
+    @SuppressWarnings("unchecked")
+    private java.util.List<String> latestSettlementFanCodes(GameSession session) {
+        return session.getEvents().stream()
+                .filter(event -> event.eventType() == GameEventType.SETTLEMENT_APPLIED)
+                .reduce((first, second) -> second)
+                .map(event -> (Map<String, Object>) event.payload().get("settlementDetail"))
+                .map(detail -> (java.util.List<Map<String, Object>>) detail.get("fans"))
+                .map(fans -> fans.stream()
+                        .map(item -> String.valueOf(item.get("code")))
+                        .toList())
+                .orElseGet(java.util.List::of);
+    }
 }

backend/src/test/java/com/xuezhanmaster/game/service/HuEvaluatorTest.java

@@ -59,4 +59,26 @@ class HuEvaluatorTest {
 
         assertThat(result).isFalse();
     }
+
+    @Test
+    void shouldRecognizeSevenPairsWinningHand() {
+        boolean result = huEvaluator.canHu(List.of(
+                new Tile(TileSuit.WAN, 1),
+                new Tile(TileSuit.WAN, 1),
+                new Tile(TileSuit.WAN, 2),
+                new Tile(TileSuit.WAN, 2),
+                new Tile(TileSuit.WAN, 3),
+                new Tile(TileSuit.WAN, 3),
+                new Tile(TileSuit.TONG, 4),
+                new Tile(TileSuit.TONG, 4),
+                new Tile(TileSuit.TONG, 5),
+                new Tile(TileSuit.TONG, 5),
+                new Tile(TileSuit.TIAO, 6),
+                new Tile(TileSuit.TIAO, 6),
+                new Tile(TileSuit.TIAO, 9),
+                new Tile(TileSuit.TIAO, 9)
+        ));
+
+        assertThat(result).isTrue();
+    }
 }

docs/DEVELOPMENT_PLAN.md

@@ -232,6 +232,13 @@
 - 统一玩家可见状态模型
 - 前后端统一阶段与动作枚举语义
 
+### 5.3 注释与脚本约定
+
+- 后端新增或修改的业务代码，需要为复杂规则、关键字段和跨阶段状态补充简洁中文注释，避免只靠方法名猜语义。
+- 前端新增或修改的页面与状态逻辑，需要为复杂交互、实时消息消费和视图状态切换补充简洁中文注释，避免后续拆页时理解断层。
+- 后续数据库表结构、迁移脚本、初始化 SQL 与存储过程，也需要补充必要中文注释，重点说明业务含义、约束原因与关键索引用途。
+- 注释要求遵守 `KISS`：只解释不直观的意图、约束和边界，不写“变量赋值”这类冗余注释。
+
 ### 5.2 最关键的系统约束
 
 #### 约束一：教学必须基于玩家可见状态